13 September 2007 A novel structure of directly patterned isolating layer for organic thin-film transistor-driven organic light emitting diodes
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Abstract
Mono-chrome phosphorescence Organic light emitting diodes (OLEDs) operated by organic thin-film transistors (OTFTs) with a 32×32 array are fabricated with a novel method, and the results reveal a fabulous demonstration. The later isolation, which segregated source/drain electrodes and an OLED cathode, was designed in our OTFT-OLED pixel. In the OTFT-OLED process; we used the polymer isolating layer which was deposited by spin coating and patterned by traditional photo-lithography before the organic semiconductor and OLED deposition. However, the residue polymer affect of OTFT electric properties which have poor mobility (5×10-4 cm2/V-s), a lower on/off ratio (~103), and a positive threshold voltage (4.5 V), and devices, have poor uniformity. Using UV-Ozone treatment could enhance OTFT mobility (2×10-2 cm2/V-s) and permit higher devices uniformity, but the threshold voltage would still have a positive 5.1 V. This threshold voltage was not a good operation mode for display application because this operation voltage was not fit for our driving systems. In order to overcome this problem, a new structure of OTFT-OLED pixel was designed and combined with a new-material isolating layer process. This new process could fabricate an OTFT-OLED array successfully and have a nice uniformity. After the isolating layer process, OTFT devices have a higher mobility (0.1×10-2 cm2/V-s), a higher on-off ratio (~107) a lower threshold voltage (-9.7 V), and a higher devices uniformity.
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Yi-Kai Wang, Yi-Kai Wang, Tsung-Hsien Lin, Tsung-Hsien Lin, Jing-Yi Yan, Jing-Yi Yan, Tzu-Wei Lee, Tzu-Wei Lee, Yu-Yuan Shen, Yu-Yuan Shen, Shu-Tang Yeh, Shu-Tang Yeh, Mei-Rurng Tseng, Mei-Rurng Tseng, Po-Sheng Wu, Po-Sheng Wu, Kuo-Tong Lin, Kuo-Tong Lin, Chia-Hsun Chen, Chia-Hsun Chen, Jia-Chong Ho, Jia-Chong Ho, } "A novel structure of directly patterned isolating layer for organic thin-film transistor-driven organic light emitting diodes", Proc. SPIE 6658, Organic Field-Effect Transistors VI, 665819 (13 September 2007); doi: 10.1117/12.733588; https://doi.org/10.1117/12.733588
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